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I'm not sure if this is what you are looking for.
This is a quote from APCO International:

New applications for 25 kHz bandwidth will be accepted until January 1, 2011
After this date, applications for greater than 12.5 kHz bandwidth will be accepted only if the equipment meets the efficiency standard of one voice channel/12.5 kHz bandwidth or 4800 bps/6.25 kHz (9600 bps for 12.5 kHz; 19.2 bps for 25 kHz)
Modifications of existing 25 kHz systems will be accepted until January 1, 2011
After this date, applications to modifications to 25 kHz systems which result in an expanded service contour will be accepted only if the equipment meets the efficiency standard of one voice channel/12.5 kHz bandwidth or for data, 4800 bps/6.25 kHz (9600 bps for 12.5 kHz; 19.2 Kbps for 25 kHz)
25 kHz equipment can be manufactured and imported until January 1, 2011
After this date, equipment operating at greater than 12.5 kHz bandwidth must meet the efficiency standard of one voice channel/12.5 kHz bandwidth or 4800 bps/6.25 kHz.
90.203(j) has been amended to allow certification of equipment operating at 25 kHz after January 1, 2005 if it meets the efficiency standards listed above. Effective date of 90.203(j)(5) has been stayed until the FCC releases a decision on the Manufacturers Petition for stay. (See next article).
The FCC also revised its rules to exempt Part 90 paging-only frequencies from the narrowbanding requirements.